PHP 8.4 support (#84)

Author: bytestream

.github/workflows/build.yml

@@ -11,6 +11,8 @@ jobs:
             matrix:
                 operating-system: ['ubuntu-latest']
                 php-versions:
+                    - '8.4'
+                    - '8.3'
                     - '8.2'
                     - '8.1'
                     - '8.0'

library/HTMLPurifier/HTML5Config.php

@@ -60,10 +60,16 @@ public static function inherit(HTMLPurifier_Config $config)
 
     /**
      * @param HTMLPurifier_ConfigSchema $schema
-     * @param HTMLPurifier_PropertyList $parent OPTIONAL
+     * @param HTMLPurifier_PropertyList|null $parent OPTIONAL
      */
-    public function __construct(HTMLPurifier_ConfigSchema $schema, HTMLPurifier_PropertyList $parent = null)
+    public function __construct(HTMLPurifier_ConfigSchema $schema, $parent = null)
     {
+        if ($parent && !$parent instanceof HTMLPurifier_PropertyList) {
+            throw new InvalidArgumentException(
+                'Argument #2 ($parent) passed to ' . __METHOD__ . '() must be an instance of HTMLPurifier_PropertyList or null'
+            );
+        }
+
         // ensure 'HTML5' is among allowed 'HTML.Doctype' values
         $doctypeConfig = $schema->info['HTML.Doctype'];